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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d3f2c25ff97352fefd38aa56a9efb8ffe6eabb5944095fabd3d4a32c676de3' 
  AND token = '2XfhDKeSQWoQdqzssisC4YOOn7DPB0aTvPKSh0xs4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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