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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebca1330c59307b5548278762eec11c6db7b19d05211ae88caf13649634ff6d' 
  AND token = 'v8Tr8CbzdI/SCKtjCJb+lUz5DWddmWzRZAK2c5FYZDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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