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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942526476826d32940453704b0890597cc2e41516d0a997df5322103bb5e67bb' 
  AND token = 'nNQ9obyj0Er5GEMSCALmlj15Jp9uyB7CiNernR40lyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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