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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2c480b593c4fc2bdb4501aaf1fda7c07bb5a3bb9719422bd00bb73b33d1c9a' 
  AND token = 'N+j9m/2+DzEc4VVfh4rskl6XV0TBCQItCeaVH45BniY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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