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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbbd3b66cc0b6f2eb46a8ceb6a1a2b94fd9747de97ba6e5243bb2e523dd34d5' 
  AND token = '31uzEYsufOtx5kqZYX/hd1bI01ks+c/akP5Fa2uuWW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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