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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd91b4358bc1108ce01a869eb9ab6e0bdc5b8283c1ed188e592a9f46e2a1e74' 
  AND token = 'sXP+Nin3KUna4t11t4O1s3O8xEeEqP7SOPUURrX/xAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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