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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef682d9cc25c6b5a5c983d811fbcd28a985b377342a7b9b850669de20465dfa' 
  AND token = '6W8jwND1AeSkQYdFEtcgHj1yQ6SvrISo49trJzkNsbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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