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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2dbc7f94cbc6d62718a8a36321729c860c7fe1cc323a539d962e20d57afe76' 
  AND token = '+HeAocilc+MfyKP8oG6KR9U7G5wKLAq3JUUZyPs+NLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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