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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372ce2a0fdbb604de4fc7d69a89500d95fe4cf148e8f9b9bb0c1f8aa8766b321' 
  AND token = 'LYBTpRvVDfeTmxO7qQeCVgmH9qXgxnyQRUqAm7SrQNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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