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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f56ddeca3f6e9a66c2cac0311e955149335026bf0898f6e3fe0aaa2735725b' 
  AND token = 'bjhqgaEaq101FiMHR/FvYkszGDQMNywKk3P8zioKR/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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