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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd1d670ae74a78e63f055748f42da1eb96692a3c568ec7777045cda6f5e8856' 
  AND token = 'fRFHZM9hUKE6URjy3I7r9t8CyLvLIqD47mscK1pTP9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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