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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1b40196959de1686fd402f394d94cb075e5c3e4e62cb88668346f759adcf54' 
  AND token = 'Hw7PEQzPN5cNM5JGxLaOnZMxZABZbFxNWvDrTpJ3ndc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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