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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73acbce8e03b01e46354999190e8a4f1a78a348a26f7e8d50db4e45f0bc57da9' 
  AND token = 'dMjG1t7jN1kIlo9s6V3NPX0x0GagY9j5Fc0RznhKtYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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