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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc339c710ac11d12031c53ecd275f6ddcd315ab6e940b8e35602120f0c8c8041' 
  AND token = 'bzrF5UGLbAL6DO2dfwnMHATMFZ0v8qKJRvH1ttPXcco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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