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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f0a46777d536529a7df580c6438bb483824970d671a7ecef44be8aabcb03d7' 
  AND token = 'Wki8PLgu9dKeVkVWtHrxRNYE0LhkFrLxTukY3HfaHpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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