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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8009db8936bbc7412dea333f6ac639628efd31281f4b05578c95b44a9471ac9a' 
  AND token = 'h5NKe8Q6xOAiyq0N/vC8sxbuHb17hFePpsmbTGfcbCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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