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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114c7c4d1106edece002c8132f20aae80f5abb5a0ed1260323e10f9226d80a7d' 
  AND token = 'hfHe1y0CucGwQUzdT089J69YSSxQ823suXaBxm/3TpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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