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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ddcac44b7c57baea10974dfd14d68872a5d94535d4b7f42240ca2a4e3c96eaf' 
  AND token = '3GF+O8ke3SX8NP/0ibxDdBmxTyUX+aos/fqWv6lg2w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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