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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b447281346847b764210c900aacf4f3a99cea71abb10d130f8d2e88b13ddf2' 
  AND token = 'OXmAt2Neq7G+76Xk8MGIVklCi56KovvQVmhAHneu/zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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