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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a83af5b64503e35025eb5c68b682fe8027f478effa1c8aa802379d429d8f97c' 
  AND token = 'zla4f91eV8sbg6ST0i5LZbFprYinb/SkkrFFWtdJeXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}