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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15140843c5f02c538e517781d4ff0b3e9438af734a3a455bad94519c96271a4f' 
  AND token = 'iKlYzuEdnpLuXy7B1hX5B5XAX7wRNAld+jvUwdf+T2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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