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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ab8269bc184067e12d468978649818620c892b86dd55ee4cbcec9af5ac159e' 
  AND token = '+g8EMZbE5dWjuXOlk41fuI6EBaFcqDcEL+x+dmGgdyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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