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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d68f8b685c4fa7e13f5d8f7207e366515f29754f2610e45ab04e840229f890' 
  AND token = 'GBI2jKVgyANGJlK0jlM4hawH12fQldJ0FAX1gX+VNaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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