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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06328610207b1520eb96389d8c5a2c54c4cca6d2945da4f10625dd6d572180f' 
  AND token = 'GSDxKMoqkxdVT+yrbtpa3MvYf5gSB4gaCfCkU6ETUV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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