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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd69b55cf54e30761a22ec91be51e4140c1eac3ed1d96c743f5cf0db8a99c8e7' 
  AND token = 'INixZzizP/FtO58VFnuK6GOYyo8aLbahXnBUw3ZG5Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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