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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3e5924f0b702ac7cd3decef8b8932f7165eb2d909e7c93f0602b4d3fe6c293' 
  AND token = 'BacpWQC494hQy8OZ1U7LdGMJ+8GGM446umrjw+riA0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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