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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39eac7fc2801beb64c1c7615094ce227fb80abc8fe1632795ffd73812e266e9' 
  AND token = 'vu9PrSmZI1+Ce7Kbz1hg1gENdFcy9ugVljPONcChyQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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