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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf7552a7b4582158cf688a4ef3c5943b81d2c718f048fa2dadb1830444eb3e0' 
  AND token = 'OD4ypWlwqYd+h/o+08d/xpV0FnnH3seB/xygC8kNCmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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