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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f67d6e2c32cdbefa1ef55a8774002fef7b983ad03e9813935b65abc26a94d73' 
  AND token = '9dzP09IWhingquljfqyyzTAOZCgIW7TUICnA73CgHH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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