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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5e451d97c825f41703f3caa2e067b15c0d95c255f1e0a1136f55d05ad60277' 
  AND token = '1rn3DvQDIXyKpMioa3MM4dy3GJdNDMdoYOQP17atS0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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