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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6793af0a72d48f24861c77c9370641487ae091cdd5237f4de5e92273e6b5bb99' 
  AND token = 'vg5/k5HqTKa6U6RTA4Q9qW97qtWv5Ort78tGWbPRXEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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