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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bf84601f9cac013318d364b57f18d9a87b7c4b92567655fbf6f5db431df901' 
  AND token = 'w2Ek/VfLutBcnva7v9FnMCH59Xk4vkbLMDdZ9vCXiuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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