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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b796ca856afb7017a4f886b08f3b2cdeb42c470f4b96fada77933cbe3c42aae3' 
  AND token = 'WpA04u+65YMjyy/ZUCBOibEPIX7jNOlbXedxFlVKNFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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