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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab056e7e0e71e4951ad772f1fdd4f434474bd72b601c7be1327809fb4f17d42' 
  AND token = '4UlTjekUrFj96F3okLJ4d+0nUQevu+BVs63dKOtCm1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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