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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e2a0f9db78ee29fd504ae9c3fcc80e67bbdeeae0d616d03c6b7ac0f3650e10' 
  AND token = 'rhIJUzFwM5ZTjE/g3UmkRJMW1NoubUZYNrPu3VQTb8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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