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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ac2c8c6ac7d9ece31131d42e08617a74dbc69beb9f049851b437f8b5b794cc' 
  AND token = 'K1GeSbggX4wfs3SklBanCdD/PBC9iS7EajYP/z3XmbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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