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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f912fe16b9dac11463aceec0a64bfbbe2bb97d11d8f64063fd9a4e753572fd2' 
  AND token = 'P+Sc0gu0PikQYDg9jp49QM6jluOuR2zByZlQ+SVu6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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