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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6244d0c1e1e22396d48352410774ee28abbe8d738ffca286ca47a16df832b9b' 
  AND token = 'UmIxsofMAfr6/qi77JM8e9ei0Mc7UQZb+Wxwa03NwAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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