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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031cdea3da70eb0f7d90ad4c40a00f6d7daa2a71abe63a1981cbaa83a7bbe1d3' 
  AND token = 'uWkpueGJmXx2vabq6y7yDptQ2OzfBifCLDrOIJru2WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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