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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d84546eca3c3935877833fc5a7eb714ed361fc1da034399c6dc019757db6c82' 
  AND token = 'hSieyo3L5ZOb5gwabtV8N8plLuH0OowAajCMmkvosIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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