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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f340783f88ec47d96ffdb1ed3c577d690d88c9f6a466c45ba6e89463fac15f' 
  AND token = 'FigeBuCZ8+CxApd8auinbYSC/T5aUM7JWzKXtLrXxtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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