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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634906adad8f6f2f8f5ed8c85ab6382cfc14c5e7bc3d0e6f4ce8a77d507d573' 
  AND token = 'HSH9XYD8Jvhxcfe18WosLV+F8qLQV84Y42XOvHd3qP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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