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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab617e530d3b0018a3f5bab707ec3a411d582191b87a38dbd815a1c2f94f9eda' 
  AND token = 'pQC+8Qs0lpx3kUkkLlgYiG+iDGhIE4rz6XidulFSRRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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