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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0f6728e8982da658f9a7a817fa87835f20295712d0b19af5636c7131019ec0' 
  AND token = 'wWI5fw1uWQNBM3jB0cj4xEcudCAObrdBkoTZw7CHwog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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