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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee9aaaf9844f7609c2607bf448b2e9d9eeedfe19d5cd14a64dd3d78332093e0' 
  AND token = '11D1gnEbqIsb9DQ6U2v1lkXnyqv00WBwB26vWxYpwGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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