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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9dd44b1d3ca3b464b5bc4cc2dda0ca621404cb4549d4b27e3f7007197f93faa' 
  AND token = 'j6HcO0sudxonw7VfLhbeZAgPAFWDNAU/uUoLE7YAMds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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