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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b953ded49d6bdb61e935c6245c965c13193497abd4d514d49cf6f5262b16d9d9' 
  AND token = 'JL319ztod1JFAX66KavzVvR0A4I3inaL3d/BCReEBMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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