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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9bff42db6d3ebde56abe693af23a7ad4bd0789564e17579cb6fccb16b514fa' 
  AND token = 'j9llLkb7JUXZWwVyil2glxNiIQj7adKa+eD2vHj3jdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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