SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff9e80809f2583b28030ef7c8416da3636affb9eeb932528f04824b3a5950d7' 
  AND token = 'WHq0GQJFUv+1DPw3LDltfqhTQvzbUXaD3lzZJHnnU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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