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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb217435e9a2fda7adf0956f07476da20fd1b25487a55e0902e8dd8851933e8' 
  AND token = 'Becd/qxY0rHRcNSSHBR7JBnzzmrbQFK/tvAhDd61fjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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