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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac797c3edaf5a86f93e8861eea6882c9195f471517113e4419c42f59de81172' 
  AND token = 'Zuy3OnRLI9IYKFTLNdUG5XGf45DjqTLfhY8VcXysr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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