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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf55631bd20fb1447cc5604f362204dd69a51664d50aa7e2a11a85cff2dad9d' 
  AND token = 'sSeqY4YFGj8QuMrvcM8PiJQT8h3Y+liiymXNC91bkzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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