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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55ae052e416ff0139fc570c27f9f24ce5b9d2448ea51d9e431480099776210b' 
  AND token = '2CYWCz+dRehC/AAGwMCr9nSa9RGnjbezDOn4xn6C7xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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