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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fe618c558fb06d5683ed04081a071176901039049dc890eb781d30f5473488' 
  AND token = 'DxmibVH/mkqgGZ3XeF5kEQ1p0o1DT82uxdKq/K9HmTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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