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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37423d33adf4cd9c4a897d61d72fec1f7c61592933b06c6dc67e49f84b2b31d1' 
  AND token = 'ut/4Ixx6JkEfGF8NVpdlDRNtWUbHNh1lOttDSqOAdXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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