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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8596a33832286b3ed62580af95a60edcade108e7a783d722c310940278eb3f5' 
  AND token = 'Ju4Z/FAfRTyVxCwuzEaYy3VQnSKkbHc56lwShFKzBlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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