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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d827fe903b3547a0d8a52d0821d5fa3d1bfbe8fad78fba4c548e0c05dd08c3c' 
  AND token = 'ZnpzT43L2+MmPWQs4SuWsxXJw0M2k+7mVifd4PVMzkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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