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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c337c48266458ad618d33b25ccce3cb6a695aef3dcdb1b52b54d4c4c5e2e7000' 
  AND token = 'XOh0GkiwX/AUWIVUUEuJ9cNKFxbIO/8nD/Q9XNUI4/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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