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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3f4dd818f98e3787e7ebdd64805ea3070e3223b2982d37d8a52d48ef58a24a' 
  AND token = 'tqv6212/z1CcJh445U83fxaeRct3fEwRkKrgwTEAQgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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