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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c23e5ceea183bf5cdd96f92cd40948c6ac118a080fe647aebcf510ba9cfc01' 
  AND token = 'GGeDPokCYUxtSwcFr4ztPnR4oj1DrNrgB7gsI2m4vPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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