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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6feea9c9420544d383dd9e90974186334ecd000ae9f6ee8add424c804b69937' 
  AND token = 'tPymzSMGaAgd8z9dGzQRzoIga4lM3/JdQmJj30zdcUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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