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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba62da6d91bf10f00788684a2d8aa47f93308c751576851d8340ee6f3a842110' 
  AND token = 'DuRpqObz4jO8KqVcPGtJNRLM4vQbM6Gv+JT4rFt8pLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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